Because of their specific mechanical properties, all-ceramic restorations demonstrate a lower fracture resistance than ceramic restorations supported by metal substructures. The ceramic abutments on implants are more sensitive to fracture and to handling procedures than the titanium abutments (Andersson et al. 2001). However, advances have been made in the fabrication of high-strength all-ceramic abutments for anterior implants (Yildirim et al. 2003). The hardness of the Zirconium ceramic also allows it to undergo conventional prophylaxis with ultrasonic scalers without alteration of its surface quality of abutment (Marzouk, 1996). Moreover, Zirconia has a flexural strength and fracture toughness almost twice as high as alumina (Glauser et al. 2004, Yildirim et al. 2003).